title: Radiolucent circular line in pelvis on plain x-rays.
authors.affiliation: Department of Urology, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Niwa
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yazawa
authors.forename: Mototsugu
authors.initials: M
authors.lastname: Oya
mesh_terms: D000368:Aged; D003556:Cystitis / Q000000981:diagnostic imaging*; D004646:Emphysema / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D014057:Tomography, X-Ray Computed; D001743:Urinary Bladder / Q000000981:diagnostic imaging*